package com.tanhua.sso.service;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.tanhua.sso.config.HuanXinConfig;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @Author: JinboYang
 * @Description:
 * @Date: Created in 下午 13:02 2021/1/10
 * @ModifiedBy:
 */
@Service
public class HuanXinTokenService {

    @Autowired
    private HuanXinConfig huanXinConfig;

    @Autowired
    private RestTemplate restTemplate;

    @Autowired
    private RedisTemplate<String, String> redisTemplate;

    public static final String REDIS_KEY = "HX_TOKEN";

    private static final ObjectMapper MAPPER = new ObjectMapper();

    public String getToken() {
        //redis是否命中
        String cacheData = this.redisTemplate.opsForValue().get(REDIS_KEY);
        if (StringUtils.isNotEmpty(cacheData)) {
            return cacheData;
        }
        String targetUrl = huanXinConfig.getUrl() + huanXinConfig.getOrgName() + "/" + huanXinConfig.getAppName() + "/token";
        //设置参数
        Map<String, String> param = new HashMap<>();
        param.put("grant_type", "client_credentials");
        param.put("client_id", huanXinConfig.getClientId());
        param.put("client_secret", huanXinConfig.getClientSecret());

        //请求环信的接口
        ResponseEntity<String> responseEntity = this.restTemplate.postForEntity(targetUrl, param, String.class);
        if (responseEntity.getStatusCodeValue() != 200) {
            return null;
        }
        //获取响应体
        String body = responseEntity.getBody();
        try {
            //反序列化
            JsonNode jsonNode = MAPPER.readTree(body);
            String accessToken = jsonNode.get("access_token").asText();
            Long expiresIn = jsonNode.get("expires_in").asLong() - 86400;

            //将token保存到redis中
            this.redisTemplate.opsForValue().set(REDIS_KEY, accessToken, expiresIn, TimeUnit.SECONDS);
            return accessToken;

        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

}
